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Binary and ternary Pt-based clusters grown in a plasma multimagnetron-based gas aggregation source: electrocatalytic
W Chamorro-Coral1, A Caillard1, P Brault1
1Groupe de Recherches sur l'Energétique des Milieux Ionisés (GREMI), Université d'Orléans, CNRS 14 rue d'Issoudun BP6744 45067 Orléans cedex 2 France wachamorroc@unal.edu.co.
Nanoscale Advances
|September 22, 2022
Summary
Adding bismuth and copper to platinum clusters enhances their catalytic activity for glycerol oxidation. These novel platinum alloy clusters show improved performance due to specific surface compositions and alloy formation.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Platinum (Pt) nanoclusters are crucial catalysts, but their efficiency can be limited.
- Alloying and surface modification are key strategies to enhance catalytic properties.
Purpose of the Study:
- To synthesize and characterize novel platinum-bismuth (PtBi), platinum-copper (PtCu), and platinum-bismuth-copper (PtCuBi) alloy clusters.
- To investigate the structural and electrochemical properties of these clusters for glycerol oxidation catalysis.
Main Methods:
- Gas aggregation source (GAS) with in-plane plasma magnetrons for cluster synthesis.
- X-ray diffraction (XRD) for structural analysis and alloy formation.
- Scanning transmission electron microscope (STEM) mapping for surface composition.
- Electrochemical measurements to assess catalytic activity.
Main Results:
- PtCu clusters formed alloys, while PtBi clusters showed secondary bismuth oxide phases.
- PtCuBi clusters exhibited PtCu alloyed cores decorated with bismuth or copper-bismuth species.
- Electrochemical analysis suggested a metastable CuBi shell and enhanced catalytic activity for glycerol oxidation.
Conclusions:
- Simultaneous addition of Bi and Cu to Pt creates alloyed clusters with unique surface structures.
- These nanoclusters demonstrate improved catalytic performance in glycerol oxidation, attributed to alloy formation and surface species.
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